The American swimmers who claimed they were assaulted at gunpoint over the weekend by assailants posing as police officers fabricated their account of the episode, according to Brazilian investigators.

After watching video and hearing testimony from witnesses, the Brazilian police have determined the incident involved damage to a bathroom door at a gas station where the swimmers stopped in the early hours Sunday on the way back to the athletes’ village from a party.

A Brazilian police official who had reviewed the video images said that there had been no armed assault, contrary to what the swimmers had claimed. The official declined to be identified because the investigation was continuing.

It was not immediately clear whether an altercation occurred at the gas station between one of the swimmers and a security guard, as some news organizations have reported.